CN110132851B - Femtosecond single-pulse interference-based instantaneous two-dimensional photoacoustic wave measurement method - Google Patents
Femtosecond single-pulse interference-based instantaneous two-dimensional photoacoustic wave measurement method Download PDFInfo
- Publication number
- CN110132851B CN110132851B CN201910539672.2A CN201910539672A CN110132851B CN 110132851 B CN110132851 B CN 110132851B CN 201910539672 A CN201910539672 A CN 201910539672A CN 110132851 B CN110132851 B CN 110132851B
- Authority
- CN
- China
- Prior art keywords
- pulse
- light
- femtosecond
- interference
- photoacoustic wave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000691 measurement method Methods 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 230000003321 amplification Effects 0.000 claims abstract description 23
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 23
- 230000003287 optical effect Effects 0.000 claims abstract description 21
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 238000003384 imaging method Methods 0.000 claims abstract description 16
- 238000005086 pumping Methods 0.000 claims abstract description 16
- 230000006698 induction Effects 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 22
- 239000013078 crystal Substances 0.000 claims description 15
- 239000000523 sample Substances 0.000 claims description 9
- QBLDFAIABQKINO-UHFFFAOYSA-N barium borate Chemical compound [Ba+2].[O-]B=O.[O-]B=O QBLDFAIABQKINO-UHFFFAOYSA-N 0.000 claims description 8
- 229910052701 rubidium Inorganic materials 0.000 claims description 8
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 abstract description 4
- 230000001052 transient effect Effects 0.000 description 7
- 230000001360 synchronised effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003993 interaction Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012634 optical imaging Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000000701 chemical imaging Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/45—Interferometric spectrometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Health & Medical Sciences (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention belongs to the field of optical measurement, and discloses an instantaneous two-dimensional photoacoustic wave measurement method based on femtosecond single pulse interference, which comprises the following steps of 1) constructing an ultrafast imaging system, and realizing synchronization of a mode-locked femtosecond laser, an acousto-optic pulse selector, a pumping pulse, a detection pulse and a camera frame rate; the method is characterized in that 2) the power amplification is carried out after the femtosecond pulse is subjected to frequency reduction, the mode-locked femtosecond laser with high repetition frequency is subjected to frequency reduction, and the power amplification is carried out on the femtosecond pulse subjected to frequency reduction; 3) the photoacoustic wave induction generation module forms photoacoustic waves and filters light background noise; 4) the interference of reference light and measuring light is realized by adopting a Mach-Zehnder interference method, the reference light is modulated at high frequency, and the signal-to-noise ratio of interference fringes is improved; 5) and acquiring a single-pulse interference image within the exposure time of a single camera, and completing instantaneous two-dimensional photoacoustic wave measurement by utilizing a Fourier transform phase reconstruction algorithm. The ultra-fast imaging with sub-picosecond time resolution is obtained through experiments by utilizing the time synchronization of the exposure of the camera and the ultra-short pulse.
Description
Technical Field
The invention belongs to the field of optical measurement, and particularly relates to an instantaneous two-dimensional photoacoustic wave measurement method based on femtosecond single-pulse interference.
Background
Ultrafast laser-induced photoacoustic imaging can be used for researching nonlinear absorption and refraction characteristics of materials, spectral imaging of biological objects and noninvasive detection of sub-surface microelectronic damage, photoacoustic waves are generally rapidly transmitted in a micro area at sound velocity, therefore, transient observation of the photoacoustic waves with high transverse resolution and large field of view is a very challenging task, and the characterization of the photoacoustic waves is generally one-dimensional piezoelectric or laser vibration sensors with limited space-time resolution due to the lack of high-speed two-dimensional sensors so far.
The high-speed camera imaging based on pulse light reflection or transmitted light can be used for observing rapid physical phenomena, and the latest application of the ultrashort pulse laser enables people to observe ultrafast optical imaging on the picosecond level or even faster, and particularly photon-substance interaction observation can be realized through a pumping-detecting experiment. However, the high-speed two-dimensional cameras currently available are not sufficient for picosecond pump probe imaging, and therefore one-dimensional photodetectors are often used, with the most advanced photodetectors response times reaching several picoseconds. To achieve ultra-high temporal resolution two-dimensional measurements, one-dimensional detected two-dimensional imaging can be extended by deploying multiple photodetectors in a grid arrangement or scanning a single photodetector sequentially over a target region, but the achievable field of view is not large and the imaging lateral resolution is low. Meanwhile, due to the light background noise of the exposure time of the camera, the contrast ratio based on short pulse pumping-detection imaging is low, the imaging quality of ultrafast dynamics is limited, and quantitative analysis cannot be realized.
Disclosure of Invention
The invention aims to solve the problem, and provides a femtosecond single-pulse interference-based instantaneous two-dimensional photoacoustic wave measurement method based on femtosecond pulse ultrafast time domain characteristics, wherein the time resolution of a single-pulse interference scheme can reach 250fs, a camera only captures a single-pulse interference fringe image once within each exposure time, meanwhile, the second harmonic effect is utilized to filter out light amplification spontaneous radiation background noise, the electro-optic phase modulation improves the fringe signal to noise ratio, and the Fourier transform phase reconstruction algorithm is utilized to realize the quantitative measurement of instantaneous two-dimensional photoacoustic waves.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a femtosecond single-pulse interference-based instantaneous two-dimensional photoacoustic wave measurement method comprises the following steps of 1) constructing a femtosecond laser single-pulse interference ultrafast imaging system to realize synchronization of a mode-locked femtosecond laser, an acousto-optic pulse selector, a pumping pulse, a detection pulse and a camera frame rate; it is characterized in that the preparation method is characterized in that,
2) performing power amplification after the frequency reduction of the femtosecond pulse, performing frequency reduction on the mode-locked femtosecond laser with high repetition frequency, and performing power amplification on the frequency-reduced femtosecond pulse;
3) the photoacoustic wave induction generation module forms a photoacoustic wave, and the nonlinear crystal is used for filtering background noise of the detection light;
4) the interference of the reference light and the measuring light is realized by adopting a Mach-Zehnder interference method, and the reference light is modulated at high frequency by using an electro-optical modulator, so that the signal-to-noise ratio of interference fringes is improved;
5) and (3) instantaneous two-dimensional photoacoustic wave measurement, wherein only a single-pulse interference image is captured within the exposure time of a single camera, and the instantaneous two-dimensional photoacoustic wave measurement is completed by utilizing a Fourier transform phase reconstruction algorithm.
Preferably, the single-pulse interference image collected by the 5) camera contains phase information of the photoacoustic wave.
Preferably, the femtosecond single-pulse interference instantaneous two-dimensional photoacoustic wave measuring device comprises a mode-locked laser frequency-reduction amplification module 1, a photoacoustic wave induction generation module 26 and a single-pulse mach-zehnder interference module 27, wherein femtosecond pulses output from the mode-locked laser frequency-reduction amplification module are divided into pumping light and detection light after frequency-reduction amplification, the pumping light is incident to the module photoacoustic wave induction generation module, and the single-pulse mach-zehnder interference module 27 is incident through optical delay after filtering background noise of the detection light by utilizing a second harmonic effect of a nonlinear crystal.
Preferably, the frequency-reducing amplification module 1 of the mode-locked laser comprises an ytterbium-doped femtosecond mode-locked laser 2, an acousto-optic pulse selector 3, an ytterbium-doped laser amplifier 4, a rubidium atomic clock 6 and an arbitrary waveform generator 5, wherein the rubidium atomic clock 6 outputs sinusoidal signals which are respectively used as reference frequencies of the ytterbium-doped femtosecond mode-locked laser 2 and the arbitrary waveform generator 5, the ytterbium-doped femtosecond mode-locked laser 2 outputs a femtosecond laser seed light source, the arbitrary waveform generator 5 outputs a driving signal 7 and a camera trigger signal 8 through the acousto-optic pulse selector 3, the driving signal 7 controls a working time window of the acousto-optic pulse selector 3 to perform pulse selection, and the ytterbium-doped laser amplifier 4 is used for performing power amplification on the femtosecond pulses after frequency reduction; a synchronous mode-locked femtosecond laser repeats frequency, an acousto-optic pulse selector, pumping pulses, probe pulses and a camera frame rate.
Preferably, the photoacoustic wave induction generating module 26 includes a beam splitter prism 9, a pump light 10, a microscope objective 11 and a dichroic mirror 12, the amplified pulsed light is split into two beams by the beam splitter prism 9 as the pump light 10 and the probe light 14, respectively, and the pump light generates the photoacoustic wave by being focused by the microscope objective 11 and incident into the acetone solution 15 through the dichroic mirror 12.
Preferably, the single-pulse mach-zehnder interference module comprises a barium metaborate nonlinear crystal 13, a delay optical path 16, a band-pass optical filter 18, a first beam splitter prism 19, a second beam splitter prism 23, a reflector 21, an electro-optic modulator 20, an acetone solution 22, a microscope objective lens 24 and a CMOS camera 25, wherein detection light is reflected to the reflector 17 through the delay optical path 16 after light background noise is filtered by the barium metaborate nonlinear crystal 13, is filtered by the band-pass optical filter 18 and is divided into reference light and measurement light by the first beam splitter prism 19, the reference light is modulated by the electro-optic modulator 20 to improve the signal-to-noise ratio of interference fringes and then is reflected by the reflector 21, and is incident to the CMOS camera 25 after passing through the non-pump light induced acetone solution 22, the second beam splitter prism 23 and the microscope objective lens 24 in sequence; the band-pass optical filter is used for selecting the laser in the visible light wave band, and the interference image of only a single pulse is captured in the single exposure time of the CMOS camera.
Compared with the prior art, the invention has the beneficial effects that:
the method realizes instantaneous two-dimensional photoacoustic wave measurement by using a common camera for the first time. The ultrafast single-pulse interferometer is an effective tool for high-contrast ultrafast two-dimensional optical imaging. Ultrafast imaging with sub-picosecond time resolution is obtained through experiments by utilizing the time synchronization of each exposure time (1ms) of the camera and the ultrashort pulse (0.25 ps). Compared with the existing pulse imaging, the nonlinear second harmonic filtering effectively inhibits amplified spontaneous radiation in the pulse and improves the signal-to-noise ratio of interference fringes. The propagation of 60.8MHz photoacoustic waves in liquid is quantitatively measured through a pumping detection experiment, the two-dimensional ultrahigh-speed interference imaging capability is verified, and the feasibility of the measurement result is verified in an acetone solution by the method. Is expected to provide an economical and effective novel ultrafast imaging method for the interaction of different photon substances.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a structural diagram of the transient two-dimensional photoacoustic wave measurement method based on femtosecond single pulse interference according to the present invention.
FIG. 2 is a background noise interferogram of the transient two-dimensional photoacoustic wave measurement method based on femtosecond single pulse interference.
FIG. 3 is a background noise-free interferogram of the femtosecond single-pulse interference-based transient two-dimensional photoacoustic wave measurement method.
FIG. 4 is a laser-induced photoacoustic wave background-noise-free interferogram of the femtosecond single-pulse interference-based transient two-dimensional photoacoustic wave measurement method.
FIG. 5 is a 10ns delay phase reconstruction diagram of the transient two-dimensional photoacoustic wave measurement method based on femtosecond single pulse interference.
FIG. 6 is a 30ns delay phase reconstruction diagram of the transient two-dimensional photoacoustic wave measurement method based on femtosecond single pulse interference.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
As shown in fig. 1-6, an instantaneous two-dimensional photoacoustic wave measurement method based on femtosecond single-pulse interference includes the steps of 1) constructing a femtosecond laser single-pulse interference ultrafast imaging system, reducing the repetition frequency of femtosecond pulses, and realizing synchronization of a mode-locked femtosecond laser, an acousto-optic pulse selector, a pumping pulse, a detection pulse and a camera frame rate;
2) using an acousto-optic pulse selector to carry out frequency reduction on the mode-locked femtosecond laser with high repetition frequency, and using an ytterbium-doped laser amplifier to carry out power amplification on the frequency-reduced femtosecond pulse;
3) the high-power femtosecond pulse is divided into two beams which are respectively used as pump light and detection light, the pump light is incident into a liquid sample, a photoacoustic wave is formed by a photoacoustic wave induction generating module, and the background noise of the detection light is filtered by utilizing the second harmonic effect of the nonlinear crystal;
4) the interference of the reference light and the measuring light is realized by adopting a Mach-Zehnder interference method, and the reference light is modulated at high frequency by using an electro-optical modulator, so that the signal-to-noise ratio of interference fringes is improved;
5) instantaneous two-dimensional photoacoustic wave measurement is realized by adopting rubidium atomic clock synchronous mode locking femtosecond laser repetition frequency, an acousto-optic pulse selector driving signal and a camera frame rate, adopting optical path time delay to synchronize the flight time of pumping light and detecting light, acquiring and capturing an interference image of a single pulse within single camera exposure time and utilizing a Fourier transform phase reconstruction algorithm.
Preferably, the single-pulse interference image collected by the 5) camera contains phase information of the photoacoustic wave. Reconstructing photoacoustic waves by utilizing a Fourier transform phase reconstruction algorithm to realize instantaneous two-dimensional photoacoustic wave measurement of each interference pattern, wherein the specific algorithm is as follows: the interference intensity of a point (x, y) in a two-dimensional plane can be expressed as I (x, y) ═ a (x, y) + b (x, y) cos [ phi (x, y) +2 pi f0x]A (x, y) and b (x, y) are background light intensity and fringe contrast, respectively, f0For the fringe carrier frequency, the phase phi (x, y) is obtained by fourier transform-1{Im[c(x,y)]/Re[c(x,y)]Therein of
And then, reconstructing instantaneous two-dimensional plane photoacoustic waves by using the phase of each pixel point obtained by calculation, wherein the time resolution is 250 fs.
Preferably, the femtosecond single-pulse interference instantaneous two-dimensional photoacoustic wave measuring device comprises a mode-locked laser frequency-reduction amplification module 1, a photoacoustic wave induction generation module 26 and a single-pulse mach-zehnder interference module 27, wherein a femtosecond pulse output from the mode-locked laser frequency-reduction amplification module is divided into two beams of pumping light and detection light after frequency-reduction amplification, the pumping light is incident to the sample photoacoustic wave induction generation module to form a photoacoustic wave, and the photoacoustic wave is incident to the single-pulse mach-zehnder interference module 27 after filtering background noise of the detection light through optical delay by using a second harmonic effect of a nonlinear crystal; a rubidium atomic clock is used as a reference frequency, an arbitrary waveform generator is used for generating an acousto-optic pulse selector driving signal 7 and a camera trigger signal 8, the frequency, the acousto-optic pulse selector, a pumping pulse, a detection pulse and a camera frame rate of a synchronous mode-locked femtosecond laser are repeated, a camera captures interference fringes carrying instantaneous two-dimensional photoacoustic wave phase information, and the instantaneous two-dimensional photoacoustic wave measurement is realized by utilizing a Fourier transform phase reconstruction algorithm.
As shown in fig. 2 and 3, the method improves the stripe contrast from 0.33 to 1 by using the barium metaborate nonlinear crystal.
As shown in fig. 3, with single pulse interference, the CMOS camera captures interference fringes that carry instantaneous two-dimensional photoacoustic wave phase information.
The single pulse interference light intensity can be expressed as
Wherein the optical time delay between the reference arm and the measuring arm, IoIn order to average the light intensity,
gamma (tau) is an interference contrast function for the phase delay of the measuring arm caused by the induced generation of the photoacoustic wave by the pump light.
As shown in fig. 5 and 6, the invention reconstructs the phase of the two-dimensional photoacoustic wave and realizes the measurement of the instantaneous two-dimensional photoacoustic wave.
The frequency-reducing amplification module 1 of the mode-locked laser comprises an ytterbium-doped femtosecond mode-locked laser 2, an acousto-optic pulse selector 3, a ytterbium-doped laser amplifier 4, a rubidium atomic clock 6, an arbitrary waveform generator 5 and a camera trigger signal 8, wherein a 10MHz sinusoidal signal output by the rubidium atomic clock 6 is respectively used as reference frequencies of the ytterbium-doped femtosecond mode-locked laser 2 and the arbitrary waveform generator 5 to provide a frequency reference, the ytterbium-doped femtosecond mode-locked laser 2 outputs a femtosecond laser seed light source with the repetition frequency of 100MHz, the photoacoustic pulse selector 3 is used for outputting a driving signal 7 and the camera trigger signal 8 by the arbitrary waveform generator 5, the driving signal 7 controls a working time window of the acousto-optic pulse selector 3 to perform pulse selection and reduce the repetition frequency, and the ytterbium-doped laser amplifier 4 is used for performing power amplification on the femtosecond pulses subjected to frequency reduction. A synchronous mode-locked femtosecond laser repeats frequency, an acousto-optic pulse selector, pumping pulses, probe pulses and a camera frame rate.
Preferably, the photoacoustic wave inducing module 26 includes a beam splitter prism 9, a pump light 10, a microscope objective 11, and a dichroic mirror 12, the amplified pulsed light is split into two beams by the beam splitter prism 9 as the pump light 10 and the probe light 14, respectively, and the pump light generates photoacoustic waves by being focused by the microscope objective 11 and incident into the acetone solution 15 through the dichroic mirror 12. The pump light is focused by a microscope objective, passes through a dichroic mirror and then enters an acetone solution to generate a photoacoustic wave through induction. The detection light is filtered by the barium metaborate nonlinear crystal 13 to remove light background noise, and then enters the single-pulse Mach-Zehnder interference module 27 through the delay light path 16.
The above-mentioned transformation function of the electric field energy E of the probe light with time t can be expressed as
Wherein v isoDenotes the frequency of the light wave, and I (t) denotes the intensity of the envelope of the light wave in accordance with the Gaussian distribution, where the half-peak height width (pulse width) of the light intensity is 250 fs.
Preferably, the single-pulse mach-zehnder interference module comprises a barium metaborate nonlinear crystal 13, a delay optical path 16, a band-pass optical filter 18, a first beam splitter prism 19, a second beam splitter prism 23, a reflector 21, an electro-optic modulator 20, an acetone solution 22, a microscope objective lens 24 and a CMOS camera 25, wherein detection light is reflected to the reflector 17 through the delay optical path 16 after light background noise is filtered by the barium metaborate nonlinear crystal 13, is filtered by the band-pass optical filter 18 and is divided into reference light and measurement light by the first beam splitter prism 19, the reference light is modulated by the electro-optic modulator 20 to improve the signal-to-noise ratio of interference fringes and then is reflected by the reflector 21, and is incident to the CMOS camera 25 after passing through the non-pump light induced acetone solution 22, the second beam splitter prism 23 and the microscope objective lens 24 in sequence; after being reflected by a dichroic mirror, the measuring light sequentially passes through an acetone solution 15 induced by pump light, a beam splitter prism and a microscope, then enters a CMOS camera, and the optical path difference between the measuring light and the reference light is changed by adjusting a delay optical path; the band-pass optical filter is used for selecting the laser in the visible light wave band, and the interference image of only a single pulse is captured in the single exposure time of the CMOS camera. The method comprises the steps of filtering background noise of detection light by utilizing a nonlinear crystal, realizing time synchronization of pumping light and the detection light by utilizing a delay light path, selecting visible light wave band laser with the central wavelength of 532nm by utilizing a band-pass light filter, modulating reference light by utilizing an electro-optical modulator, improving the signal-to-noise ratio of interference fringes, and capturing an interference image of a single pulse only within a single exposure time of a CMOS camera.
The embodiments described above are only a part of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (4)
1. An instantaneous two-dimensional photoacoustic wave measuring method based on femtosecond single pulse interference is characterized in that a femtosecond single pulse interference instantaneous two-dimensional photoacoustic wave measuring device is used for reconstructing a two-dimensional photoacoustic wave phase to realize the measurement of instantaneous two-dimensional photoacoustic waves; the femtosecond single-pulse interference instantaneous two-dimensional photoacoustic wave measuring device comprises a mode-locked laser frequency reduction amplification module (1), a photoacoustic wave induction generation module (26) and a single-pulse Mach Zehnder interference module (27), wherein a seed femtosecond pulse output from the mode-locked laser frequency reduction amplification module is divided into pumping light and detection light after frequency reduction amplification, and the pumping light is incident to the photoacoustic wave induction generation module (26) to form a photoacoustic wave; the detection light utilizes the second harmonic effect of the nonlinear crystal, after the background noise of the detection light is filtered, the detection light is incident to the single pulse Mach-Zehnder interference module (27) through optical delay; the frequency reduction amplification module (1) of the mode-locked laser comprises an ytterbium-doped femtosecond mode-locked laser (2), an acousto-optic pulse selector (3), an ytterbium-doped laser amplifier (4), a rubidium atomic clock (6), an arbitrary waveform generator (5) and a camera trigger signal (8); comprises the following steps of (a) carrying out,
1) constructing a femtosecond laser single-pulse interference ultrafast imaging system, wherein a rubidium atomic clock (6) outputs sinusoidal signals which are respectively used as reference frequencies of an ytterbium-doped femtosecond mode-locked laser (2) and an arbitrary waveform generator (5), the ytterbium-doped femtosecond mode-locked laser (2) outputs a femtosecond laser seed light source, the arbitrary waveform generator (5) outputs a driving signal (7) through an acousto-optic pulse selector (3), the driving signal (7) controls a working time window of the acousto-optic pulse selector (3) to perform pulse selection, and an ytterbium-doped laser amplifier (4) is used for performing power amplification on down-converted femtosecond pulses to realize synchronization of the mode-locked femtosecond laser, the acousto-optic pulse selector, pumping pulses, detection pulses and a camera frame rate;
2) performing power amplification after the frequency reduction of the femtosecond pulse, performing frequency reduction on the mode-locked femtosecond laser with high repetition frequency, and performing power amplification on the frequency-reduced femtosecond pulse;
3) the photoacoustic wave induction generation module forms a photoacoustic wave, and the nonlinear crystal is used for filtering background noise of the detection light;
4) the interference of the reference light and the measuring light is realized by adopting a Mach-Zehnder interference method, and the reference light is modulated at high frequency by using an electro-optical modulator, so that the signal-to-noise ratio of interference fringes is improved;
5) and acquiring a single-pulse interference image within the exposure time of a single camera, and completing instantaneous two-dimensional photoacoustic wave measurement by utilizing a Fourier transform phase reconstruction algorithm.
2. The femtosecond single-pulse interference-based instantaneous two-dimensional photoacoustic wave measurement method according to claim 1, wherein: 5) the single-pulse interference image collected by the camera contains phase information of the photoacoustic wave.
3. The femtosecond single-pulse interference-based instantaneous two-dimensional photoacoustic wave measurement method according to claim 1, wherein: the photoacoustic wave induction generation module (26) comprises a beam splitting prism (9), pump light (10), a microscope objective (11) and a dichroic mirror (12), wherein the amplified pulse light is split into two beams by the beam splitting prism (9) and respectively used as pump light (10) and probe light (14), and the pump light is focused by the microscope objective (11) and enters an acetone solution (15) through the dichroic mirror (12) to generate photoacoustic waves.
4. The femtosecond single-pulse interference-based instantaneous two-dimensional photoacoustic wave measurement method according to claim 1, wherein: the single-pulse Mach-Zehnder interference module comprises a barium metaborate nonlinear crystal (13), a delay optical path (16), a band-pass optical filter (18), a first beam splitter prism (19), a second beam splitter prism (23), a reflector (21), an electro-optical modulator (20), a microscope objective (24) and a CMOS camera (25), wherein after light background noise of detection light is filtered by the barium metaborate nonlinear crystal (13), the reference light is reflected to a reflector (17) through a delay light path (16), filtered by a band-pass light filter (18) and divided into reference light and measurement light by a beam splitter prism I (19), the reference light is modulated by an electro-optical modulator (20) to improve the signal-to-noise ratio of interference fringes and then reflected by a reflector (21), and is incident to a CMOS camera (25) after being reflected by an acetone solution (22), a beam splitter prism II (23) and a microscope objective (24) which are not induced by pump light in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910539672.2A CN110132851B (en) | 2019-06-20 | 2019-06-20 | Femtosecond single-pulse interference-based instantaneous two-dimensional photoacoustic wave measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910539672.2A CN110132851B (en) | 2019-06-20 | 2019-06-20 | Femtosecond single-pulse interference-based instantaneous two-dimensional photoacoustic wave measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110132851A CN110132851A (en) | 2019-08-16 |
| CN110132851B true CN110132851B (en) | 2021-07-30 |
Family
ID=67579023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910539672.2A Active CN110132851B (en) | 2019-06-20 | 2019-06-20 | Femtosecond single-pulse interference-based instantaneous two-dimensional photoacoustic wave measurement method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110132851B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111189528B (en) * | 2020-01-09 | 2022-04-08 | 天津大学 | High-precision underwater sound velocity measurement method based on femtosecond laser frequency comb |
| CN112284510B (en) * | 2020-10-26 | 2022-12-06 | 东南大学 | Coherent acoustic phonon echo induction and detection method in multilayer two-dimensional semiconductor |
| CN114928699B (en) * | 2022-04-28 | 2023-08-01 | 中山大学 | Ultra-fast imaging method based on color digital camera |
| CN115079405B (en) * | 2022-07-05 | 2024-01-05 | 东南大学 | Method for generating photoacoustic wave in air by using ultrashort laser pulse |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7605371B2 (en) * | 2005-03-01 | 2009-10-20 | Osaka University | High-resolution high-speed terahertz spectrometer |
| JP5647942B2 (en) * | 2011-04-27 | 2015-01-07 | 富士フイルム株式会社 | Photoacoustic imaging apparatus, probe unit used therefor, and endoscope |
| CN107436293A (en) * | 2016-05-26 | 2017-12-05 | 长春理工大学 | A kind of contactless refractive index detection device based on transient state Mach Zehnder interference technology |
| CN208847209U (en) * | 2018-10-16 | 2019-05-10 | 中国计量大学 | A kind of reflective Mach-Zender interferometer based on the tilted beam splitter of optical fiber |
| CN109632726B (en) * | 2018-12-13 | 2020-10-23 | 中山大学 | Molecular dynamics measurement method and device based on quantum coherent control |
-
2019
- 2019-06-20 CN CN201910539672.2A patent/CN110132851B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110132851A (en) | 2019-08-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110132851B (en) | Femtosecond single-pulse interference-based instantaneous two-dimensional photoacoustic wave measurement method | |
| JP5501360B2 (en) | Optical microscope and control method thereof | |
| US8681331B2 (en) | Systems and methods providing efficient detection of back-scattered illumination in modulation transfer microscopy or micro-spectroscopy | |
| US9599454B2 (en) | Optical interferometer, data acquisition device, and data acquisition method | |
| US9494522B2 (en) | Device and method for stimulated Raman detection | |
| JP5649828B2 (en) | Laser microscope equipment | |
| CN111638192B (en) | Tunable pumping-detection system based on super-continuum spectrum light source | |
| US10378964B2 (en) | Pulsed light waveform measurement method and waveform measurement device | |
| JPWO2014125729A1 (en) | Measuring apparatus and measuring method | |
| WO2015130366A9 (en) | Systems and methods for high-contrast, near-real-time acquisition of terahertz images | |
| CN107529625B (en) | It is a kind of for observe in real time micro-nano transient phenomena it is continuous/burst the ultrafast imaging method of bimodulus | |
| CN107632402A (en) | A kind of continuous/ultrafast micro imaging method of the mould of burst/difference three for real-time monitored micro-nano transient phenomena | |
| US10132681B2 (en) | Noise reduction apparatus and detection apparatus including the same | |
| Petrov et al. | Ghost imaging with auxiliary multiplex channels: a review of the latest results | |
| TWI467169B (en) | Imaging system of using acoustic signal generated from pulsed laser light | |
| JP7478479B2 (en) | Light detection device and light detection method | |
| Soltanian et al. | Pulse-to-Pulse Stability Comparison Between 810 1030 and 1064nm Pulsed Laser | |
| Jadhav | All solid state single-shot Dispersion scan (D-Scan) for ultrashort laser pulses | |
| Zhang et al. | Real-time Rapid-scanning Time-domain Terahertz Radiation Registration System with Single-digit Femtosecond Delay-axis Precision | |
| JP6815846B2 (en) | Sample observation device | |
| WO2023097405A1 (en) | Chirp modulation simulated raman scattering microscopy | |
| CA3221522A1 (en) | Single-shot multi-frame ultrafast terahertz imaging method and system | |
| Saar et al. | Raman Microscope | |
| Galler et al. | Vector Pulse Shaper Assisted Short Pulse Characterization | |
| Ozeki et al. | High‐Speed 3D Spectral Imaging with Stimulated Raman Scattering |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |